Audio Database


200,000yen(around the 1992 time)

The digital-analog-converter unit only for a 75-ohm coaxial digital input developed with compact-disk transport ROK-DP1.

An input signal is led to a circuitry by the shortest distance, and in order to send out by the shortest distance, the signal substrate is being directly fixed inside the rear panel.
Moreover, in order to avoid the tone-quality failure by leading about, a switchpoint contact, etc. of a product line, an input becomes one coaxial and the output has become one analog.

The power source by a toroidal transformer is carried in the under chassis at the part, and an interference with a signal system chooses the fewest location, and is being fixed. Furthermore, the cross interferencee is suppressed by making a digital part and an analog part become independent.

In a digital-analog-converter element main unit, it is the 64 time oversampling of the U.S. Crystal Semiconductors. The 1-bit type of a delta sigma scheme is adopted. This element is suppressing the interference of digital one/analog circuit which was making the power source and ground pattern of a digital part and an analog part become independent completely, and led the power source and the earth line.

The oversampling digital filter is carried in the digital circuit 8 times.

48kHz and a 32kHz signal are also supported at others with a sampling frequency of 44.1kHz.

Since it corresponds to a future version-up, the signal substrate of ROK-design aid1 is easily exchangeable.

As an option option, there was an external power unit which raises the tone quality of ROK-design aid1 further.

Rear The

Rating of a mode
Form Digital analog converter
Input Coaxial digital: One line
Output Analog: One stereo
Sampling frequency 32kHz, 44.1kHz, 48kHz (automatic correspondence)
Dynamic range 97dB
S/N ratio 126dB
S/(N+D) ratio 94dB
Phase deviation }0.5 degree
Channel separation 100dB or more
DC offset Less than }1mV
Output power 2.0Vrm
Power source AC100V, 50Hz/60Hz
Power consumption A maximum of 10W
Dimensions Width 215x height 80x depth of 325mm
Weight 3kg
Option External power unit ROK-DS1 (280,000yen)